Thread-cutting device.



PATENTED DEC. 4, 1906.

J ROBMER THREAD CUTTING DEVICE. APPLICATION IEILED JUNE 9, 1904.'

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'fiow of surplus lubricating material.

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Specification of Letters Patent.

Patented Dec. 4, 1906.

' Application filed June 9,1904. Serial No. 211,854.

To (all whom, it nmgconccrn:

Be it known that I," JULIUS ROEMER, a citizen of the United States of America,'and a resident of Shelby, in the county of Richland and State of Ohio, have invented certain new and useful Improvements in Thread-Cutting Devices, of which the following is a specification. 4 I

The object of my invention is to provide a device connected with .oradapted to be attached to devices for cutting or forming screw-threads or grooves uponpipes or other cylindrical objects, by the use of which lubric material in sufficient amount to prevent undue heating or friction maybe easily and quickly supplied to the surface under formation and to provide means for catching the waste oil when the instrument is at rest.

To such ends my invention consists in substance of a threading or grooving device or die, means for holding the same in position, means for imparting a groove or thread formative movement to the die-holder, a reservoir for lubric material, a lubric-materialfeeding device adapted to feed lubric material to the groove orthread-points of formation, and means for receivin and retaining the excess lubric material, alt ough it is not to be understood that my invention is limited to a device comprising at once all the devices and parts before mentioned, as the same consists in the particular construction of certain devices and parts and the particular con struction, combination, and arrangement of certain devices and parts, all as more specifically set forth in the specification and pointed out in the claims.

While not limited to use therewith, as the same maybe easily applicable to grooving or screw-threading or forming machines or devices of every form, my invention is more particularly designed and adapted for use in screw-threading devices of the ordinary hand-stock form shown in the drawings, wherein similar letters or'numerals of reference designate like or equivalent parts wherever found throughout the several views, and in which Fi ure 1 is a view, partially in central longitudinal section, of a hand-stock for holding a screw-threading die, showing the application of my device for su plying lubric material to the surface to be t eaded and also the means for catching and retaining the Feveri 2 is a longitudinal View thereof, partially in section, taken on the line 2 2 of Fig. 1 and looking in the direction of the arrow at the end thereof, the thread-cutting die'omitted from Fig. 1 in order to better show the lubricating mechanism being shown in full lines in proper position therein. Fig. 3 is a view thereof on an enlarged scale in cross-section, taken on the line 3 3 of Fig. 1 looking toward the right in the direction of the arrow adjacent such line. Fig. 4 is a view looking in the direction of the arrow in Fig. 1 of the feedcoil-securing plug which abuts against the oil-reservoir-stop ing-valve lug forming the central portion 01 Fig. 3 as t e same appears when removed from the socket-piece of the die-stock. Fig. 5, is a view in detail of the waste-oil-catching thimble removed from the stock as the same would appear looking in the direction of the arrow 5in'Fig. 1. Fig. 6 is a view of the waste-oil-catching thimble shown in Fig. 5, taken in crosssection on the line 6.6 thereof; and Fig. 7 is a detail view in cross-section of one side of the lubricatingcoil, showing the angle at which the feeding orifices or perforations are formed'therein.

Referring to the drawin s, the referenceletter A designates the socket of the handstock, which'is of the ordinary well-known form, adapted to receive a removable screwthread-cutting die B of any desired diameter and pitch and also a suitable removable centering bushing or collar, held in position by a set-screw- (not shown) and the die being secured by the swinging cover-plate 12, all of which parts are of any form of construction, usually the one .in common use.

Located at the bottom of the die-cavity is usually a washer-ring 13, upon which the die rests, and within this washer-ring lies .the lubricating-coil 1,4, which is of slightly less thickness in cross-section than is the washerring B, being in die-stocks adapted for use in threading one-inch pipe usually of from throe-sixteenths to one-fourth of an inch diameter in cross-section and being formed of suitable small metallic piping bent into the shepherds crook form shown, closed at the outer end 15 and having its open inner end '16 inserted in a metallic plug 17, which is screwed firmly upon the end of such coil 14 and-also into the threaded handle-cavity of the socket A, the thread of which cavity, as well-as the male and female threads of the plug 17 and the male thread on the end of the coil 14, are all of the same pitch, by which construction and a suitable washer or gasket the same is secured in the die-stock A in" the well-known manner. A washer 24,;of, leather or other suitable-material, isi com-y pressed between the plug 17 and thepipe 21' joining-surface.

The plug 17 is provided with a central longitudinal passage or channel 19 in communication with the lubricating-coil 14, and such coil is provided on the upper inner peripheral wall with a plurality of perforations 20, the

axes of which are inclined inward toward theaxis of the coil in such manner that the lubricating material passing therethrough will be .directed upward and inward against the peripheral surface of the cylindrical body in the stock desired to be threaded, so as to thoroughl lubricate thesarne and the lower cutting-t readsiof the die.

Screwed firmly into the handle-cavity of the die-stock A, containing the plug 17 ,is the pipe or hollow handle-piece 21, forming the reservoir D for holding the oil or other lubricating material which is to feed the coil 14 by way of the channel 19 of the plug 17 through the-valve-plug 22. This valve-plug 22 is usually of brass and is driven tightly into the end of the pipe 21, so that-the outer end of such plug is flush with the end 'of such ipe bearing the maIe's'crew-thread 23, by w 'ch and plug 22 when the.

. pipe 21 is screwed firmly intothe'socket A.

outer end with the passage19 :of the plug 17 and by wayv of the transverse valve-passage 26 witha similar longitudinal passage27 in free communication at its inner end with the eil reservoir D, the transverse valve-passage 27 bemg'provided'at the upper end with the valve-seat 28, closed by the needle of the screw-threaded needle-valve stem 29, actuated' by the thumb-nut 30.

' The outer end of the pipe or hollow handie-piece 21 is closed b a Cap 31, having the air-vent 32, through t e center of which cap passes the piston-rod 33, carrying the istonplunger 34, carrying at its inner end t e capwasher or air-p ackin valve 35 of the form common in ordinary bicycle air-pumps, and

6c surrounding the piston-rod 33, between the cap 31 and the outer end of the plunger 34, so as to normally keep such plunger pressed inward into the.-.reservoir'f D, ,is' the spiral spring 35, such plunger being stopped-by an '65 actuating-head 37, secured upon the outer form, the central portion still-forming a tight he valve-plug 22 is provided with the longitudinal passage 25 in communication at thev end of the piston-rod33, which head is usually of slightly larger-diameter than is the cap'3r1, as shown. .The other "handle-pipe 38 is screwed into the die-socket A in like manner and being closed at the end by'a washer 39, 79' held in position by a screw -cap 40; its outer end portion lying between the-oil-catching -thiin 1e 41, and such cap 40 constitutes the waste-o'il-retaining reservoir E, the end of which reservoir E nearest to' the die-stock A is closed by a valve-thimble 42 usually of the form shown, carrying a a'vity-valve 43 of the form shown, which w en the reservoir E, is uppermost will be closedsoas to prevent any of the oil in such waste-oil reservoir E from passing out through the same toward the die-stock A,'and that when this position is reversed andv the reservoir D is uppermost such valve will be in the open position shown in the figures. riphery of such reservoir E, between the valve-thjmble 42 and the die-stock A, is the waste-oil-catching thimble 41, having the annular oil-cup 44, which is shown in detail in Figs. 5 and 6, the holes 45 in the inner an 90. nular wall of which are in registry with holes 46, formed in and through the wall of the pipe. It will be seen that whe ii Eis underneath and the valve 43 in the open position shownin Fig. 1 any waste oil in the inside of the die-stock will pass to the valve 43 by wa of the orifice or assage 47 in such stock, an any waste oil helh on or flowing onto the outside thereofwill gradually drip down into the annular drip-cup 44 and pass to such valve by way of the holes 45 and 46. Usually lightly retard the How of oil to the lubri'calll g-odfl- 14 the axis of the passage plug 17'when the parts are in osi- "ghtly staggered to the axis 0 the. outlet-passage 25 of the valve-plug 22; but, if desired, the same may be made coincident. The operation of the device'is as follows The reservoir D being about half filled with oil or other lubric material and the arts bein in the position shown in Fig. 2, wit the die secured in position by the cover-plate 12, the stock is placed upon the end of the pipe or body to be threaded, the same passing through the bushing 11, which is of the same size as such pipe so as to hold same straight until the end of such body comes in contact with the lower cutting teeth or threads of the die B, the body to be threaded being secured in a horizontal position. The oil-reservoir D is then brou ht to an upright position, the needle-valve closed by rotation of the thurnb-nut 30, and a sufficient quantity of oil is then forced out through the perforations 20 of the lubricating-coil 14 by drawing out the piston 34 and releasing the same, so that the force of the spring 36 will cause an air-pressure to be generated in the air-filled space of the reservoir D above the loo Secured upon the outer peopened, such air-pressure will cause the oil to be forced out through the perforations of the lubricating-coil 14 in a plurality of fine streams and directed against the lower cutting-teeth of the die B and the surface of the article to be cut ad'acent thereto. The die-stock is then rotated in the usual manner andthe flow of oil regulated as the work progresses by proper manipulation of the head 37 and the Valve thumb-nut 30. I

One of the chief advantages of my invention lies in'the fact that the oil is directed upon the stock and the lies at the cuttingpoint, and that'the quantity of oil directed upon the stock may be unerringly regulated to suit the varying qualities of dies and 1 stock.

As before stated, 'the main and rincipal idea of my invention may without eparting from the scope thereof be applied to other devices thanihand-stocks, and-I do not limit handle forming areservoir secured in the die 'ing the coil in the die-stock, ahollbw 1. The combination with a die-stock adapt ed to receive a die, ofa lubricatin -coil surrounding the receiving-orifice, a ug securhandle forming a reservoir secured to the die-stock,

oilforcing means in the handle, said plug having a passage for permitting oil to, pass from the hollow handle to the coil and avalve for controlling the passage of oil to the coil, substantially as described.

' 2. The combinationwith adi'e-stock adapted to receive a die, of a lubricating-codewrounding the stock-receiving orifice adjacent to the die-stock, a plug securin the coil in the die-stock, having a in communication wit stock, a plug for closin the reservoir and having a longitudinal out ct-passage in com'mu nication at one end with the passage of the coil-securing plug and at'the otherwith a passage similar to itselfby way of a transverse passage provided on one side with a valve-seat, a valve, and means for forcing the lubric material from the reservoir throu h the plugs and coil, substantially as set fort 1i 3. The combination with a die-stock adapted to receive a die, of a lubricating-coil surrounding the stock-receiving orifice adjacent to the die-stock, a plug securin the coil in the die-stock having a passage therethrough in communication with the coil, a hollow handle forming a reservoir secured in the diestock, a plug having passages extending from opposite ends and overlapping each other, a transverse passage connecting said overlapping ends, said passages being in comin'unication with the passage in the coil-securing plug, a valve controlling said transverse passage and means for forcing oil from the passage. t 'erethrough Y the coil, a hollow die-cavity of the stock and a check-valve for hollow handle'through said passages when the valve is open, substantially as described.

4. The combination with a hand die-stock having a plurality of handles of oil-feeding means carried by one handle and oil-collecting means carried by anotherhandle, substantially as described.

5. In a hand die-stock, a hollow handle closed-at the outer end secured in the diestock, and means for directin the waste oil to the reservoir thus formed by the handle, substantially as set forth.

6. In a hand die-stock, a hollow handle closed at the outer end secured in thediestock and forming a reservoir, and a valve adapted to open when the handle is below the die-stock and close when it is above said stock located in the handle adjacent to the stock and means for directin oil through said valve to the reservoir, su stantially as set forth.

7. In a hand die-stock, a hollow handle closed at the outer end secured in the diestock and forming a reservoir, a thimble 41 provided with perforations 45 secured upon the handle withsuch perforations in registry with similar perforations 46 arranged to direct the oil 'into the handle-reservoir, and an annular drip-cup 44 secured to the thimble and a check-valve for preventing backflow of 'oil, substantially as set forth.

between thereservoir in the handle and the preventing backfiow of oil, substantially as set-forth. I

Q. In a hand die-stock, a hollow handle closed at the outer end secured in the diestock, a valve adapted to open when the diestock'is upward and adapted to close when it is downward located in the handle adjacent JULIUS ROEMER.

Witnesses:

H. W. HILDEBRANDT, V. O. PETERS. 

